JPH05164320A - Liquid fuel supply device and its electromagnetic pump - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a liquid fuel supply apparatus and an electromagnetic pump thereof, and an object thereof is to reduce unpleasant odors which are likely to occur during fire extinguishing or ignition. With this liquid fuel supply device and electromagnetic pump, the discharge valve 13 provided in the fuel flow path is formed of a magnet, and the discharge valve seat 12 is an electromagnet structure, and a fixed time (several seconds) is set when the electromagnetic pump is stopped or ignited. ) By energizing the discharge valve seat 12 so that the magnetic poles generated there are the same as the magnetic poles of the discharge valve 13, the discharge valve 13 is opened by the repulsive force of the same poles, and the liquid fuel in the oil feed pipe 5 or nozzle Is returned to the electromagnetic pump 4 or the tank 2. Therefore, the amount of the oil with increased thermal expansion in the oil supply pipe 5 and the nozzle, which is generated when the electromagnetic pump is stopped or ignited, is not supplied to the combusting portion to emit an unpleasant odor or generate tar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel supply device for supplying fuel to a combustion section such as an oil fan heater and its electromagnetic pump.

[0002]

2. Description of the Related Art A conventional liquid fuel supply device of this type is shown in FIG.
As shown in FIG. 3, an electromagnetic pump 102 is arranged above the tank 101 holding the liquid fuel, and the electromagnetic pump 102 sucks up the liquid fuel in the tank 101 and supplies it to the combustion unit 104 through the oil supply pipe 103 to burn it. It has become.

As shown in FIG. 8, the electromagnetic pump opens and closes the discharge valve 106 and the intake valve 107 in accordance with the vertical movement of the plunger 105 to suck the fuel from the tank 101 and supply it to the combustion section 104. ing.

[0004]

However, in the above conventional configuration, the oil pump pipe 10 is driven by the electromagnetic pump 102.
The liquid fuel supplied to the combustion unit 104 via 3 is connected to the oil supply pipe 103 and this even when the electromagnetic pump 102 is stopped and faces the vaporization unit 108 of the combustion unit 104 as shown in FIG. The amount of expansion oil generated due to the temperature rise of the nozzle 109 or the like is supplied to the combustion unit 104.

For example, at the time of combustion, the oil supply pipe 103 and the nozzle 109 near the combustion section 104 are also at high temperature,
The oil supply pipe 103 and the nozzle 109 are cooled by the liquid fuel in the tank 101 sucked up and supplied by the electromagnetic pump 102. However, when the combustion is stopped and the supply of the liquid fuel is stopped, the cooling effect by the liquid fuel disappears, the temperature of the liquid fuel rapidly rises in the oil supply pipe 103 and the nozzle 109, and the amount of the expanded oil is increased by the combustion portion 1.
A little later than 04, the solution is dropped into the vaporizing section. The dropped amount of the expanded oil is vaporized in the vaporization section 108 of the combustion section 104 and causes a large amount of unburned gas, a strong odor, and tar formation.

Similarly, at the time of ignition, the liquid fuel in the oil feed pipe 103 and the nozzle 109 expands due to the temperature rise of the combustion section 104 before the ignition starts, and is vaporized in the vaporization section 108 of the combustion section 104 to generate a large amount of unburned fuel. It may cause fuel gas, a strong odor, and tar formation.

This phenomenon appears remarkably when the temperature of the oil feed pipe 103 and the nozzle 109 rises most immediately after the electromagnetic pump is stopped, and gives a discomfort to the user.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to eliminate the supply of unnecessary liquid fuel before ignition or after extinguishing the fire and reduce the generation of odor and tar.

[0009]

In order to achieve the above object, the present invention has a tank for holding fuel, an electromagnetic pump for supplying fuel from the tank to a combustion section, and a pump drive for controlling driving of the electromagnetic pump. The electromagnetic pump has a discharge valve formed of a magnet, and a valve seat solenoid is provided around a discharge valve seat opened and closed by the discharge valve. The valve seat solenoid is temporarily energized to generate the same magnetic pole as the magnetic pole of the discharge valve on the discharge valve side of the discharge valve seat to repulsively open the discharge valve, or a tank containing fuel and a combustion unit from this tank. An electromagnetic pump that supplies fuel to the vaporization unit, a pump drive control unit that controls driving of the electromagnetic pump, and a combustion control unit that controls the vaporization unit to heat to a predetermined temperature before a combustion start command. The electromagnetic pump has a discharge valve formed of a magnet, and a valve seat solenoid is provided around a discharge valve seat that is opened and closed by the discharge valve, and the pump drive control unit temporarily operates before a combustion start command. Is configured to energize the valve seat solenoid to generate the same magnetic pole as the magnetic pole of the discharge valve on the discharge valve side of the discharge valve seat to repulsively open the discharge valve, and the electromagnetic pump is a pipe that forms a liquid fuel flow path. A column, a plunger located in the tube column for sucking and discharging liquid fuel by vertical movement, a solenoid located around the tube column to vertically move the plunger, and a liquid located above the tube column. A discharge valve that opens when discharging fuel and closes when sucking, a discharge valve seat that is opened and closed by the discharge valve, and a suction pipe that is provided below the pipe column and serves as a path for sucking up the liquid fuel in the tank. Comprising a, and the discharge valve is formed by magnets, the discharge valve seat is a discharge valve at the valve seat solenoid energization provided seat solenoid around a structure such as to open in the repulsive force of the same poles each other.

[0010]

According to the present invention, the expansion oil amount of the liquid fuel generated by the temperature rise of the oil supply pipe or the nozzle at the time of ignition or extinction is recovered in the electromagnetic pump or the tank by opening the discharge valve in the electromagnetic pump. Therefore, the unnecessary liquid fuel is not dropped and supplied to the combustion section, and the problems such as the generation of a large amount of unburned gas generated by the expansion oil amount being vaporized in the combustion section, the generation of a strong odor, and the generation of tar do not occur.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, in FIG. 2, reference numeral 1 is a main body case, 2 is a tank for holding liquid fuel, which is arranged on a side portion of the main body case 1, and a detachable cartridge tank 3 is arranged above the tank. 4 is an electromagnetic pump arranged on the upper surface of the tank 2,
Reference numeral 6 denotes a combustion unit for vaporizing and burning the liquid fuel supplied by the electromagnetic pump 4 through the oil feeding pipe 5, and has the same structure as the conventional one shown in FIG. A combustion cylinder 7 that guides the above is provided.
Reference numeral 9 denotes a convection blower 8 which covers the combustion cylinder 7 and is arranged rearward.
It is a duct that mixes the indoor air flow from the above with the above-mentioned combustion exhaust gas to generate warm air.

Next, the electromagnetic pump for supplying the liquid fuel will be described. In FIG. 1, 10 is the electromagnetic pump 4 described above.
A discharge column 11 that connects the oil supply pipe 5 is connected to the tip of the column that forms a liquid fuel flow path therein. A discharge valve seat 12 is provided in the discharge coupling portion 11 and has a discharge port 12a. A discharge valve 13 opens and closes the discharge port 12a, which opens when the liquid fuel is discharged and is closed by a discharge spring 14 when sucking the liquid fuel. The discharge valve 13 is formed of a magnet, and is set so that the discharge valve seat 12 side has, for example, an N pole. The attraction force of the magnet of the discharge valve 13 is set to be relatively weak so that it is separated from the discharge valve seat by the pump action to open it. 15 is the discharge valve seat 12
The discharge valve 13 is opened and closed by a valve seat solenoid disposed around the.

Reference numeral 18 denotes a plunger located below the discharge valve seat 12, which moves up and down, and when it goes downward, the intake valve 1
9 has a suction valve portion 21 therein for sucking the liquid fuel between the discharge valve seat 12 and the suction valve seat 12 and closing the suction valve 19 with a suction spring 20 to push the liquid fuel upward when going upward. And is supported by springs 22 and 23. Reference numeral 24 is a solenoid arranged around the pipe column 10 and is used for the plunger 1
8 is moved up and down, and an upper magnetic path 25 for transmitting a magnetic force line from the solenoid 24 to the tube column 10 and pulling up the plunger portion 18 upward, and a lower magnetic path 26 for transmitting the magnetic force line to a lower portion thereof. It is arranged. 27 is the tube column 10
With a suction pipe arranged at the lower end of the filter, a net-like filter 28 for filtering dust and the like at the lower end to prevent it from entering the inside.
Is attached.

Reference numeral 30 denotes a pump drive control section for controlling the energization of the valve seat solenoid 15 and the solenoid 24 for the plunger 18, and operates so as to receive the output from the combustion control section 31 as shown in FIG. It has become. The combustion control unit 31 operates based on an operation start command from the operation switch 32, issues a combustion start command to the pump drive control unit 30 according to a predetermined program, and starts combustion. .

In the above structure, first, fuel is supplied from the cartridge tank 3 into the tank 2 so as to maintain a constant oil level, and is sucked up from the tank 2 to the combustion section 6 by the electromagnetic pump 4 via the oil supply pipe 5. Supplied. Then, it is combusted in the combustion section 6, the combustion exhaust gas flows upwardly of the combustion cylinder 7, is mixed with the indoor air flow from the convection blower 8 in the duct 9, is discharged as warm air, and is used for heating.

Next, the liquid fuel supply will be described.
When a combustion start command is issued from the combustion control unit 31, the solenoid 24 for the plunger is energized and driven to start combustion as shown in the flowchart of FIG. That is, when the solenoid 24 is energized, the solenoid 24
From the upper magnetic path 25 through the plunger 18, the lower magnetic path 26
Then, a magnetic field is generated toward the solenoid 24, and the plunger 18 is pulled up. At this time, the discharge valve 13 is opened, the suction valve 19 is closed, and the liquid fuel in the space between the discharge valve seat 12 and the plunger 18 is coupled to the discharge coupling portion 11 via the discharge port 12a of the discharge valve seat 12. Discharge to the oil supply pipe 5.

When the energization of the solenoid 24 is stopped,
The plunger 18 is lowered to its original position by the springs 22 and 23. At this time, the discharge valve 13 is closed, the suction valve 19 is opened, and the space between the discharge valve seat 12 and the plunger 18 is filled with the liquid fuel sucked from the lower suction pipe 27. The liquid fuel in the tank 2 passes through the filter 28, is sucked from the suction pipe 27 by repeating ON / OFF of the power supply to the solenoid 24, and is supplied to the combustion unit 6 via the oil supply pipe 5.

Next, when a command to stop combustion is given, the solenoid 24 for the plunger is stopped from being energized, and at the same time the valve seat solenoid 15 is energized for a predetermined time (several seconds).
Open 3. That is, the valve seat solenoid 15 is energized for a certain time (several seconds) to generate the same magnetic pole as the discharge valve 13 on the discharge valve side of the discharge valve seat 12, that is, the N pole in this embodiment, to repulsively open the discharge valve 13. The liquid fuel in the oil supply pipe 5 is returned to the electromagnetic pump 4 or the tank 2 in excess of the expansion oil amount. That is, since the discharge valve 13 is opened when the plunger 18 is lowered downward when stopped, the liquid fuel in the oil supply pipe 5 is sucked through the discharge port 12a,
Also, from the tip of the oil supply pipe 5 on the principle of siphon, the tank 2
The liquid fuel is returned by the oil level drop difference of the liquid fuel inside.

Therefore, when the combustion is stopped, the expanded oil amount of the liquid fuel generated by the temperature rise of the oil feed pipe 5 and the nozzle is not dropped and supplied to the combustion section 6, and a large amount of unburned gas is generated and a strong odor is generated. It is possible to reduce defects such as tar formation, and to perform good combustion for a long period of time.

FIG. 5 is for solving the problem at the time of ignition, and is structurally the same as that already described, but the operation of the combustion control unit 31 and the pump drive control unit 30 is different, so the flowchart of FIG. It will be explained using.

First, when a combustion start command is issued, the combustion control unit 31 outputs this to the pump drive control unit 30, and the pump drive control unit 30 energizes the valve seat solenoid 15 for a predetermined time (several seconds) in the same manner as described above. The discharge valve 13 is opened. After that, the combustion control unit 31 starts heating of the vaporization unit, and when the vaporization unit reaches a predetermined temperature, the solenoid 24 for the plunger is energized to start combustion.

Here, even if the temperature of the vaporization section rises and the temperature of the oil supply pipe 5 and the nozzle rises, the fuel inside the nozzle and the like returns to the electromagnetic pump 4 and the tank 2 as in the above-described example. Since it does not swell into the combustion section 6, it is possible to reduce the generation of a large amount of unburned gas, a bad odor, and the generation of tar, and it is possible to perform good combustion for a long period of time. it can.

In the above description, an example in which the problems at the time of ignition and the problem at the time of extinguishing are only separately solved has been taken as an example, but these may be combined to solve the problems of both ignition and extinguishing at the same time. Other configurations may be any configurations as long as the object of the present invention is achieved.

[0024]

As described above, the liquid fuel supply device and the electromagnetic pump thereof according to the present invention collect the liquid fuel in the oil supply pipe or the like into the electromagnetic pump or the tank at the time of ignition or extinguishing, and before the ignition or The unnecessary liquid fuel supply to the combustion part caused by the temperature rise of the oil supply pipe and the nozzle when the electromagnetic pump is stopped after the fire is extinguished is eliminated, and the expanded oil amount of the unnecessary liquid fuel is vaporized in the combustion part. It is possible to reduce the unpleasant sensation given to the user, such as the generation of unburned gas and a strong odor, and it is also possible to reduce the generation of tar and to perform good combustion for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a liquid fuel supply apparatus and an electromagnetic pump that forms a main part thereof in an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a warm air heater using the same device.

FIG. 3 is a block diagram showing a control unit of the same apparatus.

FIG. 4 is a flowchart showing an operation of the control unit.

FIG. 5 is a flowchart showing an operation in another example of the control unit.

FIG. 6 is a sectional view of a main part of a warm air heater using a conventional fuel supply device.

FIG. 7 is a sectional view of a combustion unit according to the related art and the present invention.

FIG. 8 is a sectional view of a conventional electromagnetic pump.

[Explanation of symbols]

 2 Tank 4 Electromagnetic Pump 5 Oil Pipe 6 Combustion Section 10 Pipe Column 13 Discharge Valve 15 Valve Seat Solenoid 18 Plunger 16 Intake Valve 24 Plunger Solenoid 27 Intake Pipe 30 Pump Drive Control Section 31 Combustion Control Section

Claims (3)

[Claims] 1. A tank containing fuel, an electromagnetic pump for supplying fuel from this tank to a combustion section, and a pump drive control section for controlling the drive of the electromagnetic pump, wherein the electromagnetic pump has its discharge valve. A valve seat solenoid is provided around the discharge valve seat that is formed of a magnet and is opened and closed by this discharge valve, and the pump drive control unit temporarily energizes the valve seat solenoid when fuel supply is stopped. A liquid fuel supply device configured to generate a magnetic pole that is the same as the magnetic pole of the discharge valve on the discharge valve side to repulsively open the discharge valve. 2. A tank for holding fuel, an electromagnetic pump for supplying fuel from this tank to a vaporization section of a combustion section, a pump drive control section for controlling driving of the electromagnetic pump, and a vaporization section before a combustion start command. And a combustion control unit for controlling so as to heat the valve to a predetermined temperature, the electromagnetic pump forms a discharge valve thereof with a magnet, and a valve seat solenoid is provided around a discharge valve seat opened and closed by the discharge valve. Further, the pump drive control unit temporarily energizes the valve seat solenoid before the combustion start command by the combustion control unit to generate the same magnetic pole as the magnetic pole of the discharge valve on the discharge valve side of the discharge valve seat and repulsively open the discharge valve. A liquid fuel supply device configured to operate. 3. A tube column forming a liquid fuel flow path,
A plunger located inside the tube column that sucks and discharges liquid fuel by vertical movement, a solenoid that is located around the tube column and moves the plunger up and down, and a liquid fuel located above the tube column that discharges liquid fuel. And a discharge valve that opens and closes when inhaling, and a discharge valve seat that opens and closes by this discharge valve,
A suction pipe serving as a path for sucking up the liquid fuel in the tank, which is disposed below the pipe column, and the discharge valve is formed of a magnet, and the discharge valve seat is provided with a valve seat solenoid around the valve seat. An electromagnetic pump that opens the discharge valve with the repulsive force of the same pole when the solenoid is energized.